Ah, distinctions, distinctions!
In my own private notes of Strictly Personal Prejudices, I made these observations:
The notion of concealing a coin in a hand while simultaneously revealing parts of the hand--the full palm or sides of the palm--to be ostensibly "empty" has been done purposefully or intuitively or accidentally since Day One.
During the last century it became a planned, strategic, and NAMED ACQUITMENT where the performer under the guise of another, logical action (that was an important part of the overall choreography)hid a coin while STRONGLY SUGGESTING that the palming hand is empty. It was a subliminal, rehearsed thing.
Malini and Ramsay used a natural finger-palm most of the time. Kaps preferred a Classic Palm in regards to applying this subtlety. (I don't KNOW this for a fact; however, their work suggests this...)
None of these gentleman claimed or named the concept. Other magicians, looking for a useful cognomen, named them for those they saw frequently using the Subtlety.
...if you use a finger-palm and flash the rest of your palm, you are using a MALINI or RAMSAY SUBTLETY. If you are Classic Palming and part of the palm is visible, you are using the KAPS SUBTLETY.
However, when I'm practicing alone in my padded cell, I don't call these approaches ANYTHING.
I just sit there and grin...
like a loon...
...muttering something about "ugly angles."